365681 has 4 divisors (see below), whose sum is σ = 366912. Its totient is φ = 364452.

The previous prime is 365669. The next prime is 365683. The reversal of 365681 is 186563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 365681 - 2¹⁰ = 364657 is a prime.

It is a super-2 number, since 2×365681² = 267445187522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 365681.

It is not an unprimeable number, because it can be changed into a prime (365683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 866.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2³⁶⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

365681 is a deficient number, since it is larger than the sum of its proper divisors (1231).

365681 is an equidigital number, since it uses as much as digits as its factorization.

365681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230.

The product of its digits is 4320, while the sum is 29.

The square root of 365681 is about 604.7156356503. The cubic root of 365681 is about 71.5101131635.

The spelling of 365681 in words is "three hundred sixty-five thousand, six hundred eighty-one".